随着电话网的程控化，电话普及率的不断提高，电话网的新业务需求与日剧增。一般在电话网中每增加一种新业务，全网中的各个交换机必须增加相应的软件，即打补了或升版，有时还需增加相应的硬件。显然，这样做要影响电话网的安全运行，而且工作量很大。况且对有些新业务，仅仅 With the programmed control of the telephone network and the continuous increase of the telephone penetration rate, the new business demand of the telephone network has been increasing rapidly with Japan. Generally in the telephone network for each increase in a new business, the entire network of switches must add the appropriate software, that is, make up or upgrade, and sometimes need to increase the appropriate hardware. Obviously, this will affect the safe operation of the telephone network, but also a heavy workload. Moreover, for some new businesses, only